This paper discusses a simple yet accurate approach for modeling W-CDMA power amplifiers. Several stages of the modeling process are presented. First, the test signals are defined. W-CDMA signals are approximated using simple periodic signals. These signals are then used as inputs to the power amplifier (PA) measurement system. Second, a process for deriving the AM/AM and AM/PM characteristics is given. The AM/AM and AM/PM characteristics, which are derived directly from the measured PA data, are used as the basis for modeling. The tapped-delay-line (TDL) model is used to model the AM/AM and AM/PM characteristics. The TDL model is accurate to -40 dB when linear filters are inserted before and after the AM/AM and AM/PM characteristics are modeled.
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